Every candidate for the past 40 years have shown their taxes, with the exception of Crooked Donald, so it has sort of become the norm... expected.
If the court takes the case, it will be interesting to follow.
But I will say, there is some merit to the argument that this could allow all 50 states to have different measures to become a presidential candidate, which they all have now in one degree or another, but it could make it worse if other states start adding their own different measures based off of this requirement being allowed?? I dunno??? This requirement has been the norm though, even without a specific law on it...
on the other hand, in this global economy and world we live in, having access to the candidate's returns could give us voters information on whether the candidate is likely to be breaking the emoluments clause in the future, if they became president.